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2x2 + 7x + 3 = (2x + 1)(x + 3)

If 2x2 + 7x + 3 = 0 then:

(2x + 1)(x + 3) = 0

⇒ (2x + 1) = 0 → x = -1/2

or (x + 3) = 0 → x = - 3

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โˆ™ 2011-12-12 21:36:59
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